After following the steps above, do this:
Unblocking a sender is a simple process of navigating to and removing the address from the "Blocked" list. Once removed, the flow of communication is restored, though you should manually move any existing emails from the Junk folder to the Inbox to teach Outlook that the sender is trusted. unblock sender outlook
Microsoft is transitioning everyone to a unified web-based version. If your Outlook has a in the top-left corner, you are using the new version. After following the steps above, do this: Unblocking
If you're using the Outlook desktop application, follow these steps to unblock a sender: After following the steps above
Best for unblocking on the go.